Slippage drawing roller



Feb. 25, 1930. GMlNDER 1,748,711

SLIPPAGE DRAWING ROLLER Filed Oct. 25, 1928 1 iii- K INVENTOR AT ORNEY ing these needles.

Patented Feb. 25, .1930

EHIL GMINDER, OF BEUTLIINGEN, GERMANY SLIPIPAGE DRAWING ROLLER Application filed October 25, 1928, Serial no. 314,895, and in Germany October 31, 1927.

In drawing apparatus for sliver it is customary to provide a pair of feeding rollers, and a pair of discharge rollers, and to run the latter at higher speed than the former. Additional sets of rollers may be installed therebetween as needed. It is also customary to apply a greater pressure to the upper roller of the discharge pair than to the upper roller of the pair directly in advance of said discharge rollers so that the individual fibres may slip or slide between the rollers of said intermediate pairs.

Devices of this kind have proved to be reasonably satisfactory for smooth fibres which are not very long, such as cotton, stapled artificial silk, etc. For Very long fibres, especially such as have a rough surface, for instance, raw untreated fibre, apparatus the character heretofore employed is not entirely satisfactory.

In order to obtain satisfactory results, especially when rough material is employed, it is desirable that the sliver be distributed as much as possible in a direction transverse to that of the direction of the travel of the fibre, and it is also desirable that the fibres be straightened out at the same time.

In carrying out my invention I provide a pair of slippage drawing rollers, one of which is designed similar to a carding roller with needles arranged in rows, while the other roller is provided with grooves receiv- The rows of needles enter the grooves, while the ribs between the grooves hold the material between the rows of needles at a pressure which permits the sliding of the individual fibres between the two rollers. The needles pierce the bundle of fibres, separate the fibre mass transversely to the running direction of the sliver, and simultaneously straighten out the fibres.

In the accompanying drawings I have illustrated somewhat diagrammatically two forms which my invention may assume.

' 4 In these drawings:

Fig. 1 is an end View of the rollers of a drawing apparatus, the grooves of the intermediate roller being arranged longitudinally;

Fig. 2 is a view similar to Fig. 1 showing the grooves arranged circumferentially;

Fig. 3 is a face view of the pair of intermediate rollers shown in Fig. 2, portions of said rollers being in section;

Fig. 4 is a plan view of certain of the parts shown in Fig. 1; and

Fig. 5 is a face view of the intermediate rollers shown in Figs. 1 and 4, portions of said rollers being in section.

In the construction illustrated in Fig. 1 there is provided a pair of feeding rollers 10, 60 11, a pair of discharge rollers 12, 13, and a pair of intermediate rollers 14, 15. The upf per roller of each pair is pressed against the lower roller, and the pressure applied to the upper discharge roller 12 is greater than that applied to the upper feeding roller or the upper intermediate roller 14.

I have not illustrated the pressure applying, nor the driving means, as these may be the same as are commonly employed in the art.

In carrying out my invention the upper or pressure roller 14 of the intermediate pair is provided with a series of longitudinal grooves spaced by ribs, and the lower inter- 75 mediate roller 15 is provided-with a series of longitudinally extending rows of needles 17. The'spacing is such that each row of needles enters a corresponding groove during the ro tation of the rollers, and the ribs between adjacent grooves on the roller 14 press against the surface of the roller 15 between ad acent rows of needles. The needles pierce the bundles of fibres, and as the bundle is caused to slip endwise between the rollers the needles will act to separate the fibre mass transversely and tend to straighten out the fibres.

In the construction illustrated in Figs. 2 and 3 there is employed the same feeding and discharge rollers as in Fig. 1, but the upper intermediate roller 16 has circumferential rather than longitudinal grooves. The lower intermediate roller 17 has circumferential rows of needles corresponding to the grooves of the upper roller. The ribs between adj acent grooves press against the surface of the lower roller between adj acent rows of needles and hold the fibre mass sufiiciently tight so that individual fibres may be drawn through. The needles in this case act as they do in the first mentioned form, that is they pierce the bundle of fibres, separate them transversely, and straighten out the fibres during the slipping and stretching action.

If the space between the pairs of rollers is comparatively large, it is difiicult to bring to the discharge rollers the fibres which are picked up by the needle roller between ribs and the fibre mass, due to being pressed against the surface of the needle roll, has a tendency to stick on the needle roller. To avoid this there is provided an auxiliary roll- ,er 18 between the slippage rollers 16, 17 and the discharge rollers 12, 13. This auxiliary roller conducts to the discharge rollers the fibres which are picked up by the needle roller. The auxiliary roller may have any desired form of surface, and is not required where the space between the drawing rollers is short as in that case the placing of the discharge rollers close to the needle roller wi l avoid the necessity for the auxiliary roller.

Although I have illustrated only a single pair of grooved and needle slippage rollers it will of course be obvious that additional pairs may be proviled if desired, and that there may also be employed auxiliary pairs of an intermediate pair of slippage rollers, one

of said slippage rollers having grooves and ribs and the other having a plurality of needles arranged to enter the grooves, the ribs of the first mentioned roller being of greater height than said needles, and the rollers being so juxtaposed that said ribs engage the surface of the second mentioned roller be tween the needles and permit'slippage of the material.

2. An apparatus of the character described including a pair of slippage rollers, one roller having a series of circumferentially extending grooves and the other having a series of circumferentially extending rows of needles adapted to enter said grooves. 

